// 设置响应头的中间件

module.exports = async (ctx, next) => {
  const contentType = 'application/json; charset=utf-8'
  ctx.set('Content-Type', contentType)
  // 配置跨域请求
  ctx.set('Access-Control-Allow-Origin', '*')
  ctx.set('Access-Control-Allow-Methods', 'OPTIONS, GET, PUT, POST, DELETE')
  await next()
}